Ten Berge et al., in 2019 [51], analyzed a panel of cytokines—including IL-1β, IL-1ra, IL-2, IL-6, IL-6rα, IL-7, IL-8, IL-10, IL-17A, IL-23, thymus- and activation-regulated chemokine (TARC), monocyte chemoattractant protein-1 (MCP-1), TNF-α, PGF, and VEGF—in patients with glaucoma, age-related macular degeneration (AMD), retinitis pigmentosa (RP), and cataracts, using a multiplex assay. Here, CCL2 is linked to retinitis pigmentosa 1.